Akai ABTS- M10 Manual de usuario

AKAL

TAPE

RECORDER

woo.

IWI=10

MRR

SSS

TABLE

CONTENTS.

SPECIFICATIONS

....

cece

ene

MEASURING

METHOD

......

2...

eee

ees

CONTROL

LOCATIONS

...

2.0...

eee

DISMANTLING

TAPE

TRANSPORT

UNIT

AMPLIFIERS

....

2.6.06.

ccs

ence

eee

ees

TRANSPORT

MECHANISM

..........0-02

eee

MECHANISM

ADJUSTMENT

............-2+2

2000)

AMPLIFIER

ADJUSTMENT

...

1.0.0...

eee

MAINTENANCE

PROCEDURES

.......-..-2--00055

COMPOSITE

VIEWS

COMPONENTS

..........--

TROUBLE

SHOOTING

CHART

..........------

05s

SCHEMATIC

DIAGRAM

SPECIFICATIONS

STYLE

Portable

WEIGHT

37.4

lbs

(17

kg)

DIMENSIONS

14”

8-7/8”

(358

358

227

mm)

POWER

SUPPLY

100

240

50/60

RECORDING

SYSTEM

In-line

4-track

stereo,

monaural

record-

ing

using

Cross-field

Bias

Head.

PLAYBACK

SYSTEM

IN-line

4-track

stereo,

monaural

play-

back.

TAPE

SPEED

1-7/8,

3-3/4

and

7-1/2

ips.

TAPE

SPEED

DEVIATION

Within

0.8%

WOW

AND

FLUTTER

(Play

back

only)

Less

than

0.1%

1r.m.s.

7-1/2

ips.

Less

than

0.2%

r.m.s.

3-3/4

ips.

Less

than

0.3%

r.m.s.

1-7/8

ips.

FREQUENCY

RESPONSE

25,000

7-1/2

ips.

18,000

3-3/4

ips.

9,000

1-7/8

ips.

SIGNAL

NOISE

RATIO

Better

than

48 db

(Forward

Operation)

Better

than

(Reverse

Operation)

DISTORTION

Within

Line

Output,

1,000

Recording

and

Playback.

CROSS

TALK

Less

than

—65

(Monaural)

Less

than

—43

(Stereo)

ERASE

RATIO

Less

than

—70

INSULATION

RESISTANCE

than

M.Ohms

INSULATION

DURABILITY

$00

for

than

one

minute

duration.

LINE

OUTPUT

Output

Impedance

........

100

Ohms.

Required

load

impedance

than

K.Ohms.

1.23

(+4

dbs)

POWER

OUTPUT

Watts

(r.m.s.)

per

channel,

total

(External

watts

Speaker

Jack)

Inpedance:

«4

vscceas

coeds

ohms

DIN

OUTPUT

O4V

Output

Impedance

.......

K.Ohms.

Required

load

impedance

than

K.Ohms.

LINE

INPUT

Above

(~25

dbs)

Impedance

.......:.....

175

k.Ohms.

DIN

INPUT

High

........

Above

(—25

dbs)

Impedance

........

150

(—45

dbs)

LOW

exe

ont

Avove

(—45

dbs)

Impedance

.............

K.Ohms.

MIC.

INPUT

Above

0.5

(—65

dbs)

Impedance

.............

4.7

K.Ohms.

FAST

FORWARD

AND

REWIND

TIME

seconds

for

full

1,200

foot

tape

Hz.

seconds

for

full

1,200

foot

tape

Hz.

MONITOR

SYSTEM

The

program

being

recorded

can

monitored

using.

Stereo

Headphonc

Ohms)

.......

Stcteo

Headphone

Jack.

Crystal

Receiver

Line

Output

Jack.

MOTORS

CAPSTAN

MOTOR

Hysteresis

Synchronous

3-speed

(2-4-8

pole)

motor

Condenser

Capacity

(50

Hz)

(60

Hz)

Revolution

3,000

—

1,500

750r.p.m.

(50

Hz)

3,600

—

1,800

900r.p.m.

(60

Hz)

REEL

MOTOR

i112,outer-rotor

motors.

Revolutions

930

r.p.m.

100

1,120

r.p.m.

110

HEADS

REC/PLAY

HEAD

In-line

4-track

stereo

and

monaural

Impedance

...

1,200

Ohms

1,000

Hz.

Capi:

fii

ote

Bae

2/1,000

ERASE

HEAD

In-line

4-track

stereo

Impedance

......

500

Ohms

KHz.

Gap:

erected

0.2mm

BIAS

HEAD

In-line

4-track

stereo

Impedance

......

500

Ohms

KHz.

Gap:

:onccrseea

taal

aca

0.2

RECORDING

LEVEL

INDICATOR

VERTICAL

Indication

Meter

TRANSISTOR

USED

ICAA-072D

2SD92

2SC458

(B)

28C372

2SC693FU

2SC971

2SD223

DIODE

USED

SB-3-01P

IN34A

10D4

15B2

V06C

RD24A

(M)

REELS

USED

7”,

5”,

3”

reels

10-1/2”

Reel

Adaptor

available

optional

accessory)

ll.

MEASURING

METHOD

TAPE

SPEED

DEVIATION

Method

involving

use

pre-recorded

tape.

For

measuring

the

tape

speed

diviation,

play

back

the

pre-recorded

tape

1,000Hz+

0.1%.

Connect

the

appropriate

output

frequency

counter

meter

order

measure

the

tape

speed

deviation

from

the

resulting

deviation

the

measured

frequency.

Method

involving

use

timing

tape.

(designed

for

tape

speed

measurement)

This

method

utilizes

timing

tape

marked

intervals

7-1/2”.

The

running

time

over

marked

sections

tape

measured

order

calculate

the

deviation

the

tape

speed.

applying

this

method,

however,

should

kept

mind

that

the

timing

tape

stretch

contract

measurement

enor

inevitable,

that

it is

necessary

measure

the

total

length

the

tape

advance.

WOW

AND

FLUTTER

Playback

the

3,000

pre-recorded

tape

which

the

wow

and

flutter

level

guaranteed

smaller

than

0.07%

for

measurement

means

wow

meter.

also

possible

for

3,000

sine

wave

recorded

and

played

for

measurement

means

the

wow

meter.

this

case,

however,

the

wow

meter

indicates

value

much

twicc

the

value

given

the

specifi-

cations

the

first

page.

FRQUENCY

RESPONSE

RECORD

Give

sine

wave

1,000

the

Line

Input

the

recorder

tested

through

attenuator

from

audio

frequency

generator.

Set

the

Record/Playback

Knob

“Rec”

position

and

adjust

the

line

input

volume

that

the

Meter

needle

indicates

“O”’

VU.

Set

the

Equalizer

Switch

7-1/2”

3-3/4”

position.

Under

the

condition

described

(2),

lower

the

input

level

means

the

attenuator.

Record

the

spot

frequency

the

range

25,000

from

the

audio

frequency

generator.

PLAYBACK

Set

the

Record/Playback

Knob

“Play”

position.

Connect

Vacuum

Tube

Volt

Meter

the

Line

Output

Jack.

(VTVM

with

milli

volt

scale.)

Playback

the

reocrded

tape.

Playback

the

recorded

spot

frequencies

and

make

memo

output

level

and

plot

the

value

graph.

Mic.

input

Oscillator

Microphone

Line

output

jack

TOTAL

HARMONIC

DISTORTION

FACTOR

KHz

Distortion

meter

Audio

Oscillator

Connect

the

measuring

instrument

shown

above,

and

record

the

1,000

sine

wave

“O”

VU.

Playback

the

resulting

signal

and

measure

the

overall

distortion

factor.

Measure

the

noise

level

the

tape

recorder

with

the

tape

removed

;

connect

the

audio

oscillator

directly

the

distortion

meter

for

measurement

the

distortion

factor

the

oscillator.

The

required

distortion

factor

may

obtamed

from

the

results

the

above

measuement

the

following

formula

do=d-di_

where,

Required

Overall

distortion

factor

Noise

level

Distortion

factor

the

oscillator

(Note

New

tape

particularly

good

quality

should

used

for

measurement

the

distortion

factor.)

SIGNAL

NOISE

RATIO

M-10

Set the

Equalizer

Switch

“7-1/2

ips”

position

and

playback

tape

containing

sine

wave

recorded

“O”

level

standard

recorder.

Connect

V.T.V.M.

the

line

output

jack

the

recordir

and

measure

its

output.

Then

remove

the

tape

and

measure

the

noise

level

under

the

same

condition.

Convert

into

decibels

each

the

measured

values.

CROSSTALK

(Crosstalk

between

the

tracks)

(TAPE)

Tape

direction

Tape

direction

shown

the

figure,

first

record

1,000

sine

wave

track

No.3

level.

Next,

remove

the

1,000

input

signal

and

record

under

non-input

condition.

Then,

Playback

the

tape

track

No.3

and

No.

(reversed

condition

tape)

through

the

1,000

B.P.F.

(Band

Pass

Filter,

Sensitivity....

1:1)

and

obtain

ratio

between

the

two

from

the

following

formula.

log

——*—

(db

eee

(db)

Desired

crosstalk

ratio

(db)

1,000

signal

output

level

CLZLZZZ2

1,000

crosstalk

output

level

RES

Non-input

signal

record

level

lll.

CONTROL

LOCATIONS

eNO

suet)

tees.

seaveess

asecrt

taurion

penega?

tctcres

debe,

ait

‘wonerk

Contd

eit

SEMICEARCE

faci

eBUiaL

DATE

HeRUICIRE

ALi

Stee

PeaaNRL.

IV.

DISMANTLING

TAPE

TRANSPORT

UNIT

AMPLIFIERS

sen

case

trouble,

etc,

necessitating

disassembly,

please

disassemble

the

order

shown

photographs.

Remantle

reverse

order.

DISASSEMBLY

TAPE

TRANSPORT

jai

BACK

PAN

DISASSEMBLY

AMPLIFIER

TRANSPORT

MECANISM

SUPPLY

‘

MOTOR

"bos

fo)

TAPE

SPEED

SW.

re)

O1OV

AGIOOVO

OH?

—e]

-»

6OHE

SWOO6

swoos

REVI

6w45W)

2201N)

TEN(

ofo

swoos

revi

Swoldd

SOHz~»

6OHZ

TAKE

UP.

motor

Toe

Fig.

5-1]

COM,

ool

SQ>>—r

FORWARD

—é

(82)

REV4

REVERSE

PLGR.

AClOOVO

”

seo

—£X<}H

sovenoip

—17}+

RELAY

—He—

NORMAL

CLOSED

CONTACT

——{}-—

NORMAL

OPEN

CONTACT

Fig.

5-2

SUPPLY

VOLTAGE

BOTH

TORQUE

PINCH

ROLLER

PRESSUR

1.5

Kgr

MOTORS

DURING

RECORDING/PLAYBACK

1.8

Kgr.

Recording/Playback

(Normal

Recording)

[ee

SUPPLY

Set

Recording/Playback

Knob

(A)

Playback

Position.

(50

gr)

The

Pinch

Roller

presses

against

Capstan

move

the

(100

gr)

tape

the

rated

speed.

The

Brake

Levers

free

the

Brake

severse

and

the

Lever

Spring

(G)

turns

‘“‘ON’’

Microswitch

(180

gr)

(SW006)

(F)

that

both

torque

motors

become

operative

(at

shown

diagram

illustration).

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